Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f6eea1825f6d29…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 03:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d0b1315af2e4abe5af4cdca7e12308e SHA-1: 300ad818262709f1381637b0831669c08f1bd8f0 SHA-256: 85f6eea1825f6d292be04c48d2dc87c540c4fcca611e55f05a447395c5dab0a3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term' in one of the URLs indicates a tracking mechanism, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=can+android+phones+read+qr+codes PDF link annotation
    • https://cafesca.info/ckfinder/userfiles/files/mamiwutakebolowe.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/motiba.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/nisekebaximokazuxoxorubo.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/mupaxebulufemuzogebumija.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/filobuzakewaliniwixeji.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/c3d98e.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/dawibeweratuzidujuwob.pdfIn PDF document text
    • http://sieuthibds.net/images/files/40003520465.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/57588019579.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/deribowoxetidasadolevele.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/15569624259.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ae3c75cb086557d685db1e8e3fa8f17b/10532804244.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/ketabufamid.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/24831112458.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/87442273123.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/vupubazebokejawisok.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/55523666418.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/55516667211.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/zifipafoxofuwunanun.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15b30042f---sopamotex.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/nabuxulik.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 18172 bytes
SHA-256: c75065ef0fb011205efe4e72990683aa5c65c414496e5735e2be3b296789e800
font_01_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 10644 bytes
SHA-256: ff02b6b08db50798c4a2cabafd7f03c32c6c0b8c47180f1e1127fa3824da5ae9

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